Mechanism of enrichment of trace metals on fine sludges collected from filtration plants |
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Authors: | Hisayuki Teraoka Susumu Nakashima |
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Affiliation: | (1) Institute for Environmental Measurement, Kansei Kogyo K.K., Omiya-cho 2-4-12, Sakata-shi, 998 Yamagata-ken, Japan;(2) Institute for Agricultural and Biological Sciences, Okayama University, Kurashiki-shi, 710, Okayama-ken, Japan |
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Abstract: | Fine sludges were collected from five filtration plants, and the partitioning of ten metals (Ag, Cd, Mn, Zn, Pb, Cu, Sn, Co, Ni, and Fe) in them was determined by selective leaching techniques. (1) The available amounts, which shows the total of each metal leached between 1 M CH3COONH4 and 30 percent H2O2, for Ag, Cd and Mn, ranged from 51 to 98 percent for five sludges. (2) The available amounts for Zn, Pb, Cu, and Sn were 47–92 percent for five sludges. (3) The most important fraction for Co, Ni, and Fe, except the Inagawa sludge, which is markedly polluted by organic matter, was the crystalline particle. Therefore, the above metals, except Co, Ni, and Fe, are thought to be enriched on ion-exchangeable sites, organic matter, hydrous Fe/Mn oxides, and sulfides in fine sludges. |
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